Though the LONGSHOT LR-3 and Marksman target-camera systems have built-in batteries that last for 12 hours, there's always the chance that your range session will go longer! Plus, ranges that have these cameras set up for multi-day shoots need to get batteries refreshed and ready to roll again as quickly as possible, so that's why the company rolled out this 12V DC Battery Charger! The design works with the lithium-ion batteries on board the LONGSHOT cameras and charges quickly.